An improved analysis method of constant-current charge/discharge curves and its application to nickel hydroxide electrode
(1. Department of Chemistry, Zhejiang University,
Hangzhou 310027, China;
2. State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110015, China)
Hangzhou 310027, China;
2. State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110015, China)
Abstract: The derivative of charge and discharge curves (dt/dE vs E plot) can be used to describe the charge and discharge process more exactly. The dt/dE—E plots of nickel hydroxide electrode at different charge/discharge rates and intermittent discharge experiment are discussed. Though the dt/dE—E plot is affected by many factors, it clearly has intrinsic relation with the nature of active material such as conductivity and thermodynamic potential of active material, which changes with the state of charge. The dt/dE—E plot can also be applied to other electrochemical active materials, especially to those having several phases during charge or discharge.
Key words: nickel hydroxide electrode; constant-current charge/discharge curve; derivative